Britain has become the first country in the world to allow the creation of human embryos from the DNA of three people, a technique intended to help mothers avoid passing on genetically degenerative diseases to their babies.

For years, parents of babies who seem likely to develop a peanut allergy have gone to extremes to keep them away from peanut-based foods. Now a major study suggests that is exactly the wrong thing to do.

For a generation, many North American parents have indulged children’s picky eating tendencies by sticking them in an endlessly repeating loop of chicken fingers, burgers, pizza, plain pasta, mac and cheese, and grilled cheese sandwiches.

Dr. Frank Jagdis knows measles. As a medical student in the pre-vaccination 1960s and later as a practising pediatrician in Victoria, he saw the toll that measles took on children who came down with the viral infection.